Comparison of relationship of some traits of spud as influenced by plant population and N using of correlation and ANOVA analysis

To investigate the study of comparison of relationship of some traits of spud as influenced by different plant densities and nitrogen levels using of correlation and ANOVA analysis, a field experiment was carried out in Ardabil, Iran, during 2009. The experimental design was factorial in the base of complete random block in three replication. Factors included nitrogen fertilizer rate (0, 80, 160 and 200 kg N ha-1 as urea) and plat density (5.5, 7.5 and 11 plants m-2). The resulted showed that the highest yield, number of stolon, harvest index, number of tuber and dry weight of tuber were obtained from application of 80 and 160 kg N ha-1 (commonly). Increasing of plant density resulted in higher tuber yield, No. of stolon, dry weight of tuber and total dry matter yield and decreased harvest index. Elevation of nitrogen fertilizer rate to 160 kg N ha-1 mean tuber weight and total dry matter yield improved. Too, There were significantly positive correlation between tuber yield and whole treats, than, harvest index. To obtain highest yield and avoidance of environments pollution use of 80 kg N ha-1 chemical fertilizer and density of 11 plants m-2 are recommended.